06-01-2015
If you have identical machines with different RAID I/O performance the first thing to do is compare the RAID controller parameter settings. Yes, it could be a rogue hard drive but it's more likely to be the configuration.
Adaptec RAID controllers have all kinds of parameters which can be configured using the BIOS setup or other Adaptec provided tools. I suggest that you compare, parameter by parameter, the settings of poor performing RAID controller with a good performing RAID controller.
In particular, I would be looking at the cache setup. (Use Google to read about cache (i) write-through, (ii) write-around, and (iii) write-back. That setting will most definitely greatly affect performance.)
Also, Google for "Adaptec RAID cache" to read what they say about setting the cache; the pro's and the con's.
Also, of course, search THIS FORUM for threads about this subject as you will learn personal opinions and benefit from tons of experience available on here.
Repeat, if possible, compare all the settings on the Adaptec cards one by one.
Hope that helps. Let us all know how you get on with this.
Last edited by hicksd8; 06-02-2015 at 07:01 AM..
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aac(7D) Devices aac(7D)
NAME
aac - SCSI HBA driver for Adaptec AdvancedRAID Controller
DESCRIPTION
The aac plain SCSI host bus adapter driver is a SCSA-compliant nexus driver that supports the Adaptec 2200S/ 2120S SCSI RAID card and Dell
PERC 3Di SCSI RAID controller.
The aac driver ports from FreeBSD and only supports basic RAID disk I/O functions.
DRIVER CONFIGURATION
There are no user configurable parameters available. Please configure your hardware through BIOS.
ATTRIBUTES
See attributes(5) for a description of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |x86 |
+-----------------------------+-----------------------------+
FILES
/kernel/drv/aac
32-bit ELF kernel module
/kernel/drv/aac.conf
Configuration file. (Contains no user-configurable options).
SEE ALSO
prtconf(1M), attributes(5), scsi_hba_attach(9F), scsi_sync_pkt(9F), scsi_transport(9F), scsi_device(9S), scsi_inquiry(9S), scsi_pkt(9S)
Small Computer System Interface-2 (SCSI-2)
SunOS 5.10 18 Aug 2004 aac(7D)